Final answer:
The feature you would use to adjust the spacing between a pair of horizontal type characters is called kerning. Kerning allows you to adjust the spacing between individual characters to improve the appearance and readability of text.
Step-by-step explanation:
The feature that you would use to adjust the spacing between a pair of horizontal type characters is called kerning. Kerning is a typographic term that refers to the adjustment of spacing between individual characters. It is commonly used to improve the overall appearance and readability of text.
In digital design software, such as Adobe Photoshop or Adobe InDesign, you can find the kerning options in the character or typography panel. By adjusting the kerning value, you can increase or decrease the spacing between specific characters to achieve the desired visual effect.
For example, if you have the word 'AT' and you want to decrease the space between the 'A' and 'T' to make them visually closer, you can adjust the kerning between the two characters.